Microsoft, B&Q and Pret a Manger have become the latest household names to join the 10:10 climate change campaign, joining 25,000 individuals, 1000 businesses and hundreds of schools, hospitals and other organisations.

The 10:10 campaign, which the Guardian supports, involves pledging to cut carbon emissions by 10% during 2010. Founded by the eco-documentary maker Franny Armstrong, the campaign aims to demonstrate a groundswell of public support for ambitious short-term action on climate change and put pressure on the government to commit to deep national cuts in greenhouse gas emissions.

On signing up, B&Q announced a suite of measures it will use to meet the 10:10 target. These include making its 331 stores greener with better insulation and lighting systems, and rolling out a larger fleet of double-decker delivery trucks.

Matt Sexton, the company's director of social responsibility, said: "Regardless of whether you have a commercial property or are looking at your own home, the process for lowering its carbon footprint is virtually the same.

"To begin, that means insulating well and maximising natural light so you're not paying for energy that's simply being wasted."

"We also clock up a lot of transport miles. We introduced 60 double-decker lorries this year – a move already saving us 4,800 miles a day. "

Since the launch of 10:10 last month, it has attracted a broad range of support, from Gordon Brown and the entire government and shadow cabinets, to business giants like Royal Mail and Aviva, and personalities including Sara Cox, Ian McEwan and Kevin McCloud.